Im currently using my MSI R7850-2GD5/OC Radeon HD 7850 2GB, since the screens goes black too fast, for me to actually do anything exept installing the gfx driver, when using the 290.
I’ve tried both removing the drivers (done before switching the cards, because of the fast black screens), then installing the driver with the 290 card installed, i’ve also just tried installing the newest driver and then switching the cards around.
I do not have any way to test the 290 in another system.